Now, researchers and cardiologists from the Max Delbrück Center for Molecular Medicine (MDC) Berlin-Buch and the Charité (Germany) have been able to show that this dogma no longer holds true.
Dr. Laura Zelarayán and Assistant Professor Dr. Martin W. Bergmann were able to show that the body`s own heart muscle stem cells do generate new tissue and improve the pumping function of the heart considerably in an adult organism, when they suppress the activity of a gene regulator known as beta-catenin in the nucleus of the heart cells. (PNAS, online December 10, 2008, doi: 10.1073/pnas.0808393105)*.
The gene regulator beta-catenin plays an important role in the development of the heart in embyros. Dr. Zelarayán and Dr. Bergmann could now show that beta-catenin is also important for the regeneration of the adult heart. They suppressed this factor in the nucleus of the heart cells in mice.
This way they activated heart precursor cells (stem cells) to turn on the regeneration of heart in adult mice. Four weeks after blocking beta-catenin, the pumping function of the heart of the animals had improved and the mice survived an infarction much better than those animals with a functioning beta-catenin gene. An important contribution to this project has been a transgenic mouse line generated by Professor Walter Birchmeier`s (MDC) laboratory.Markers identified for Heart Muscle Stem Cells
The researchers in Germany collaborated with scientists in the Netherlands and Belgium. For this research, Dr. Bergmann was awarded the Wilhelm P. Wintersteinpreis this summer. The research group of Dr. Bergmann, a guest researcher at the MDC who recently became Deputy of the Department of Cardiology at the Asklepios Clinic St. Georg in Hamburg, belongs to the research group of Professor Rainer Dietz (MDC and Charité).
Laura Zelarayán2, Claudia Noack2*, Belaid Sekkali3*, Jana Kmecova3*, Christina Gehrke1, Anke Renger2, Maria-Patapia Zafiriou2, Roel van der Nagel4, Rainer Dietz1, Leon J. de Windt4, Jean-Luc Balligand3 and Martin W. Bergmann1,21) Department of Cardiology, Campus-Buch & Campus Virchow-Klinikum, Charité -Universitätsmedizin Berlin, Franz Volhard Klinik, Germany
4) Department of Medical Physiology, Division Heart & Lungs, University Medical Center Utrecht, The Netherlands
*: these authors contributed equallyBarbara Bachtler
Barbara Bachtler | idw
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